Due to decrease in precipitation during GPw from 1981 to 2009,yield increased for winter wheat in Zone I and Zone II of northern China by 1.2% and 0.5%, respectively; in Zone III and Zone VIII of southern China by 1.5% and 3.1%, respectively; and for spring wheat in Zone IV of northwestern China by 1.6% (Fig. 8). Due to increase in precipitation during GPw, yield increased for spring wheat in Zone VI by 8.3%, however decreased for winter wheat in Zone V and for spring wheat in Zone VII by 0.3% and 3.3%, respectively.